This is the study of the highway you are gridlocked in. WSDOT is recommending roundabouts throughout the corridor between Sumner and Orting without addressing critical issues relative to this particular corridor.
SR162 / SR410 INTERCHANGE STUDY (link HERE)
You will find this study interesting as once again roundabouts are used without adequate study of the unique characteristics of this interchange
CONTEXT SENSITIVE DESIGN - WSDOT DESIGN POLICY
A model for transportation project development - proposed transportation projects must be planned not only for its physical aspects as a facility serving specific transportation objectives, BUT must also for its effects upon the aesthetic, social, enonomical and environmental values, needs, constraints and opportunities in a larger community setting. www.wsdot.wa.gov/Design/Policy/CSDesign.htm (will not link, copy and paste address)
PIERCE COUNTY DOCUMENTS